#sol
{
background: url(images/cerceve/sol.gif) repeat-y top left;
}
#sag
{
background: url(images/cerceve/sag.gif) repeat-y top right;
}

Yukardakiler css kodun
<body> nin altına
<div id="sol"><div id="sag">

</body> nin üstüne
</div></div>